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And to answer the question of why the large case 135i diff into a 128i, that was not the original plan.
The only gamble I knowingly took was the difference in driveshaft flanges, I wasn't expecting to receive a 215mm differential, but I will explain that below..
When I ordered the diff for a 135i a/t I was under the impression ALL automatic 135i's came with a 188mm differential. Sadly that wasn't the case, and ECS sent me a 215mm differential.
After receiving it and finding out it was a 215mm i would have had to spend $300 on shipping at the end of the day after getting the correct 188mm size diff so I decided to find out if it might work.
My research proved it will fit into the chassis and the only issue was the driveshaft flange.
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